Deterioration retarders for rubber and compositions comprising the same



United States Patent amazes Patented F eh. I 20, 1962 This invention relates to alkylated bis-phenols and compositions containing the same, and relates more par.-

ticularly to tertiary alkylt-snbstituted bisrphenols and cornpositions comprising the same wherein the alkylated bisphenol functions as a deterioration retarder.

The protection of rubbery, unsaturated, organic polyt ners, particularly natural and the butadiene synthetic rubbers, from degradation by oxygen, light and heat has be n a. maj h'i e i of: r b omman s o a y years. Many organic antioxidants and deterioration rear e ha e bee p op se nd m le e Th meet efi e e' la Qt ma er a t t i P rp h b en t die ylem ne and th r e a es r e p phe y beta naph a/ mm Th se am e nti x nts wh le hey a e tfee ive as d t e n et r ere have some di ad anta he m ie t eh le b n hat the di eele h u be Pree h he my h he e d with light colored or white rnbber stocks. Phenols and elk l p enels ha be n emised s h -d e le ih an- 7 heat as efiectively as the diarylamines.

We have now discovered that certain alkylated bisphenols are highly efiective deterioration retarders, being more efiicient than the known phenolic antioxidants and as good as: the widely used diarylamine antioxidants. In addition they possess excellent non-.discoloring and non staining properties when used in rubber compositions. Accordingly, this invention provides allgylated bis-phenolic deterioration retarders containing from 1 10 4 tertiary alkyl groups on the phenyl nuclei, and compositions of the antioxidant and the rubber wherein the alkylated his-phenols function effectively as non-discoloring, nonstaining deterioration retarders. These alkylated bisphe are ecti e i a ude) an vu c nize her compositions, v

The alk ylated bis-phenols most effective for the purposes of this invention are reaction products of certain tert a y lefih and ie-P en l er b l o 4 te ia y elefin melee ee a a d d e he b hen l n e ee li e h to the ex t s eupe- The t a a h lsnbstitutedbisephenols of this invention are prepared, for example, by condensing the tertiary olefin with the hisphenol in the presence of a condensation catalyst under proper conditions so that the esulting reaction mixture is I composed essentially of the alkylated product. The rea tion P odu l u all eente n a mi u e qt mo o,

1. cli-Pand higher tertiary alkylated his-phenols which may he fractionated into the separate components. The readten ing-methyl hfiXfillfifl, diisobntylene and the like as Wel a ix ir e e t ese e hehe hie-rheh l Pre rab e eted ith t e e t ar o efin i bi (4-h yt e 0 phen ll e eee- O he use u e rh e ud 2 7 a, .v n, t. .v his{ vdmxrpheerhbu aae ath ists-h 1r9x nh hl ZQ-Ph dihy wi pheh lflehahe F? i??? .2 pentane, 2,2-bis (4-hydroxyphenyl)pentane, 2,2-bis(4-hydroxyphenyl)hexane, 2,2-bis(4-hydroxyphenyl)-4-methyl pentane, 3,3-bis(4-hydroxyphenyl)hexane, 3,3-bis(4-hydroxyphenyl heptane, 3,3-bis (4,-hydroxyphenyl) -4-methyl hexane, 3,3-bis(4-hydroxyphenyl)-5-methyl hexane, 3,3- bis(4-hydroxyphenyl)-3,4-dimethyl pentane and the like. Mixtures of the tertiary olefins may be employed. The reactants preferably employed are isobutylene and 2,2- gis( y r xyphe y )pr p ne- Inpr'eparing the compositions of this invention, the tertiary alkylated bis-phenol is obtained by reacting, for example, isobutylene with 2,2-bis(4-hydroxyphenyl')propane in the presence of an acidic condensation catalyst in an organic solvent under the influence of heat. The reaction product after separation from the solvent is a mixture of tertiary allgylated bis-phenols consisting of the mono-, diand higher tertiary alkylated bis-phenols. The

monoand di substituted bis-phenols are effective as nonstaining non-discoloring antioxidants. It is preferred that the major component or the reaction mixture employed in rubber compositions e" higher substituted tertiary alkyl bis-phenols. The reaction mixture may be employed as'such or the various tertiary alkyl-s'nbstituted bis-phenols separated as by fractional distillation and employed as the fractions.

The condensation reaction is preferably conducted in the presence of an organic solvent inert to the reactants. Such hydrocarbon solvents as hexane, heptane, benzene, telaehe a d he li e are sa is a to y- Other 2 e ht ge a ae tie eeid ma e ehlri ed h 'ea' eh s se de tes at a tem er ure nrei eh he e 5 A a t on temper ter o ehe t e5 t9 .5 1 3- r l't ifi ve atiefeete readies r tes are tethre am sl t the eeihh reih 9 the ee ve te h be entere h e e re et he ma he eeheeete w th low h l h vated clay ren pyes many coloied and otherwise undehave eaetieh hx-Preda te Th ee a a e "d B ett-tr e a e h e Where met r more; is m ni l e l e e h a r sh? P e e abl g ea e n 0 P e h e a is e rabl o ree e hert ele si that r e than 0 Perce hi t e e tie e" w be e e h str et are h ve a Parti le si e e s ha 0-05 millimeter; The a d ee t d'ele P efe ab hae n'aeid 'e't h o is add ed w th a PH betw e 1 n 61 The E1919??? 9 ehw em leved b em' 9- t ,1 Pe e h 9 me e-1hr? ehie ht 9 other Teeid e e 'r a i hr the s heeheat eh reaet h ma be rie te Widely 12 i re a are 4 9 abet? fet eh b Wei t 9. t e Pi=PhP9 .r esteht et h e ee- The m eh 5 .ea elre P eferred is eeher hy h a ahee 9-5 ti rer- .ce

e a nts at the o her eaeta e emp ed e ewhat I?! stee i9 ehtaih e re e fi x r ha n the eatest a ti it a antioxidant, it i ne ex-Y 9 emplo rehea 4 mo e of 'he ef ia y ol n to about l moi of the bisrphenol. This 4:1 ratio of reactants, under optimum reaction conditions; resultsin high yield of the higher tertiary alkylated bisphenolj and the tertiary olefin probabl seas to th b s-passer a't'posit it W11 allyl naphthalene, vinyl naphthalene and the like.

thereto.

products, and the following compounds may be obtained as major components of the reaction mixture:

(a) The tetra-substituted reaction product CH CH CH3 i HaC-(E-CHa HaC- (ll-CH3 as well as (b) the di-substituted reaction product and (c) the mono-substituted reaction product. These specific chemicals may be obtained by fractional distillation of reaction mixtures and recrystallization from benzene. Lesser amounts of tetra-tertiary butylated product and larger amounts of mono-, diand tri-substituted products are obtained with lower concentrations of the tertiary olefin, less than 4 mols, and under less favorable reaction conditions.

The reaction product is ordinarily a yellow, relatively viscous oil which has a tendency to crystallize during extended storage periods. This tendency may be overcome by including in the reaction mixture a small amount of an aryl-substituted alkenyl hydrocarbon having the general formua wherein Ar is an aryl hydrocarbon, X is an alkylidene radical containing from 0 to 5 carbon atoms and R is a hydrogen or alkyl radical. Specific aralkenyl compounds which are suitable for this purpose include styrene, alpha-methyl styrene, para-methyl styrene, paramethyl alpha methyl styrene, ethyl styrene, allyl benzene,

Preferred amounts are about 5' to 25 parts of styrene to 100 parts of isobutylene by weight. Expressed in molar ratios, the preferred ratios of isobutylene to styrene range stance.

The condensation reaction may be carried out in an 'autoclave equipped with a stirrer, heater, a reflux condenser and inlet tubes for introducing gaseous tertiary olefins at the bottom of the reactor. The reaction is preferably conducted under an inert atmosphere such as nitrogen. A solvent such as benzene is placed in the reactor and the bis-phenol and acidic catalyst added be neutralized with an alkali such as sodium hydroxide at the end of the reaction, the product washed with water land the two layers which form then separated. The benzene is then stripped from the reaction mixture under reduced pressure. The remaining reaction product may be used as is or further purified'by fractional distillation to separate the various tertiary alkyl-substituted bisphenols.

The reaction products of this application are nonstaining, non-discoloring highly efiicient oxygen-resist- The mixture is stirred vigorously while, hearing ing deterioration retardcrs for rubbers which undergo deterioration on exposure to the atmosphere, and espe- "nitrogen over the mixture. "perature'at 70 C. and vigorously stirring, add 21 grams all natural rubbers and all vulcanizable synthetic rubbery diolefinic polymers, both unvulcanized and vulcanized. The term vulcanizable rubbery diolefinic polymer is employed in the specification and claims hereof to embrace (a) polymers of isoprene, which include the natural rubbers, and polymers of conjugated diolefins including butadiene-l,3, dimethyl butadiene, chlorobutadiene, fiuorobutadiene, cyanobutadiene and similar conjugated diolefins; (b) copolymers of these conjugated diolefins with each other; and (c) copolymers of these conjugated diolefins with other unsaturated compounds copolymerizable therewith including monoolefins' such as the vinylidene compounds represented by the 'styrenes, acrylonitriles, acrylic and methacrylic acid and their esters, isobutylene, vinylidene chloride, vinyl pyridine, vinyl esters, vinyl alkyl esters and the like. The method of preparation of the above enumerated rubbery diolefinic polymers is immaterial and the alkylated bis-phenols of this invention may be added to a solution, latex or dry polymer product as is well-known to those skilled in the art. The alkylated bis-phenol may he added as is or in a solution, emulsion, dispersion or the like.

The amount of reaction product employed as a deterioration retarder in a rubbery, diolefinic polymer may be from about 0.1 to about 10 weight percent based on the amount of polymer, but to obtain the maximum value of the reaction product as a non-discoloring, non-staining deterioration retarder, an amount from about 0.5 to 5 weight percent will generally give adequate protection.

The tertiary alkyl-substituted bis-phenols can be readily mixed with the rubbery diolefinic polymers at some stage subsequent to polymerization and prior to drying. They are also readily mixed with rubbery diolefinic polymers at the same time and in the same manner that vulcanizing or'curing agents and other compounding ingredients are added. This is the preferred method of incorporating these deterioration retarders into natural crude rubber and results in the antioxidant becoming uniformly dispersed throughout the rubber composition. However, in case of synthetic rubbery diolefinic polymers such as copolymers of butadiene with styrene or acrylonitrile which are ordinarily prepared by copolymerization in an aqueous medium, it is most convenient to add the alkylated bis-phenol compounds in an aqueous dispersion or emulsion to the latex as it comes from the polymerization equipment. This has the added advantage that when the polymer is recovered from the latex by coagulation, the deterioration retarder is already uniformly incorporated throughout the mass of the rubbery diolefinic polymers. The polymer is thus protected from the time it is made through the drying stage and storage period, and deterioration retarder does not have to be added during the compounding.

The preparation of the alkylated bis-phenols and compositions of the same in rubbery diolefinic polymers are more fully set forth in the following examples which are intended to be illustrative only since modifications and variations thereof will be apparent to those skilled in the art.

EXAMPLE A reaction vessel is equipped with a thermometer, agitator, reflux condenser and inlet openings, including an inlet tube for introducing gaseous isobutylene into the bottom ofthe vessel.

activated clay which has a pH of about 3. This mixture is vigorously stirred while heating and nitrogen is introduced at a slow rate to provide a blanket of While maintaining the tem- (0.2 mol) of styrene gradually over a period of time, such asthirty minutes, and then add 96 grams (1.7 mp1s} Compounding recipe: Parts by weight Natural rubber 100.0 Easy processing channel black" 50.0 Zinc oxide Stearic acid 3.0 Sulfur 3.0

Benzothiazyl disulfide L Three compounded stocks are prepared: ,(1) a blank without deterioration retarder (stabilizer or antioxidant), Y i a (2) a control stock with one part of phenyl beta-naphthylamine per hundred of rubber (p .h.-r.) and (3) a compound containing one part of the alkylated bis-phenol reaction product of this example per hundred of rubber (p.h.r.). The compounded stocks are cured in a steam press at 280 F. for 60 and 80 minutes. Test dumbbell strips are cut from the vulcanized stock and aged in air in open test tubes for 24 and 48 hours at 212 F. Stress strain results are obtained on both the aged and unaged samples. This test is fully described in ASTM test method D6548T. Other aged strips are subjected to flexing tests in the De Mattia Flexing Machine where the test strips are flexed and the number of flexures recorded. The flex test is carried out until crack growth has reached a rating of 7, where a rating of 0 represents no cracking and a rating of 10 represents complete break. The ratings are determined by comparison of the crack growth with established standards for each'rating. The following test results are obtained:

: PBNA' phenyl beta-naphthylamlne.

The. deteriorationproperties of the reaction product of the example are shown in the above tabulations to be superior, or substantially equal, to phenyl beta-naphthylamine, one of the most widely used antioxidants.

The reaction product of the example is tested for staining and discoloring tendencies by incorporating the reaction product into a standard White sidewall tire composition and curing in a standard steam testing press. The recipe employed is: i

Compounding recipe: Parts by weight Natural rubber-.... 100.0 Zinc oxi 85.0 Titanium dioxide, 15.0 Ultramarine blue 0.2 Stearic acid a 1.0 Hepteen base 0.3 Sulfur t 3.0 Deterioration retarder.. 1.0

A blank without deterioration retarder and a control stock containing phenyl beta-naphthylamine as the antioxidant are also compounded for comparison purposes. The cured stocks are exposed to a standard RS sun lamp at a distance of 8 inches for 24 hours to determine discoloration in the stock. In the data table given below, the larger the numerical value of the rating, the greater the discoloration.

, 'The reaction product of this example is tested for stainv ing by taking cured test pieces of the white vulcanizates obtained as described above and placing them between a White lacquered and White enameled refrigerator panels for 96 hours at 80 C. at a contact pressure of 1 pound per square inch. In the data table given below, the larger the numerical value of the fractional rating,'t he greater the stain.

The smaller fractional rating of staining and discoloration in the stock containing the reaction product of the example clearly shows the superiority of the alkylated bisphenols of this invention over the standard control antioxidant, phenyl beta-naphthylamine.

When alkylated bis-phenols of the type described are prepared using other catalysts such as sulfuric acid, paratoluene sulfonic acid, or boron trifluoride, similar excellent results are obtained. When other tertiary olefins such as diisobutylene are employed, useful products are also obtained. Bis-phenols of the type described other than the ones employed in the example given above likewise may be utilized to obtain useful nonadiscoloring, non-Staining deterioration retarders, When these prodnets are employed in rubber compounds and with other types of-unsaturated,'rubbery, organic polymers that are well-known to those slgilled in the art, similar excellent results are obtained in the protection of both unvulcanized and vulcanized compositions. Products so stabilized are extremely useful in applications Where non-staining,

non discoloring stocks are employed such as refrigerator gaskets, white sidewa-ll'tires, light colored gloves, bathing (I) PROPERTIES OF VULGANIZED RUBBER BEFORE AGING Io Antioxidant Reaction Prod- PBNA 1 Time of Cure Tensile, Elonga- Tensile. Elonga- Tensile, Elongap.s.i. tion, p.s.i. tion, p.s.i. tion,

percent percent percent v 60min 4, 010 510 4, 270 540 4, 260 510 80 min 3,180 440 ,4 480 3, 440 500 (II) PROPERTIES AFTER AGING 24 HOU S AT 212 F.;

PERCENT TENSILE RETAINED No Anti- Reaction PBNA, Time of Cure oxidant, Product. percent percent percent 60 min 51 82 80 80min 44 77 72 (III) PROPERTIES AFTER AGING 48 HOURS AT 122 F.; PERCENT TEN'SILE RETAINED No And R a i n .PBNA Time of Cure oxidant, Product, percent percent percent 60min a0 7 09 5a min"--. 2S 1 0 64 (IV) FLEX-LIFEDE MATTIA FLEXURES TO RATING 0F 10 No Anti- Reaction oxidant Product PIBNA No. of Flexures 7 13,000 93,000 as, 000 Ratio to Blank 1 7.2 7. 5

caps and similar articles.

' Although :this invention has been illustrated by means of specific examples, we do not thereby intend or desire ,to limitthe invention solely thereto, for as heretofore stated, the precise proportions and types of materials used may be varied, and obviously equivalent materials, as defined in the specification, may be employed, if desired, without departing from the spirit and scope of the invention as defined in the appended claims.

drs'closied in; i and. is: a; continuationnpart of: our earlae appiication Serial 372,389; filed? I95 fisnPa tenti bio, 257L2 h rene, p V theEneactio'n' Ebed g to the emanate we presence at an aeidie condensation in a temperature 5 ranging from about: 5 0'"; C be I a oint; or; the inert organie soly eat; an

" 5 mol of the 2;2-bis=( -hydro:xy .1:

: mols' of the two olefins ta a a new? tempest f-b i t ta t styren l ein to th reae 1. As a new compositien of matter; the reaction product- 5 ole- The {attentive subjecthittei of: this applicationfis tint? I i ia up to in which about 1 mol of the 2,2-bis(4-hydroxyphenyl)- propane and about 4 mols of the two olefins taken as a whole are brought into reactive contact and in which the two olefins are present in about 5 to parts by weight of styrene to 100 parts by weight of isobutylene.

4. As a new composition of matter, the reaction product of 2,2-bis(4-hydroxyphenyl)propane and two olefins, one of the olefins being diisobutylene and the other olefin being styrene, the reaction being carried out in an organic solvent inert to the reactants in the presence of an acidic condensation agent and at a temperature ranging from about 50 C. up to the boiling point of the inert organic solvent, and in which about 1 mol of the 2,2-bis(4-hydroxyphenyl)propane and about 4 mols of the two olefins taken as a whole are brought into reactive contact and in which the two olefins are present in about 8 to mols of the diisobutylene to about 1 mol of the styrene.

5. A rubbery composition comprising an unsaturated rubbery diolefinic polymer selected from the class consisting of a polymer of a conjugated diolefin and a copolymer of a conjugated diolefin with a monoolefin through which unsaturated rubbery diolefinic polymer is dispersed from about 0.1 to 10 weight percent based on the weight of the unsaturated rubbery diolefinic polymer of a deterioration retarder comprising the reaction product of 2,2-bis(4-hydroxyphenyl) propane and two olefins, one olefin being selected from the class of alkenyl olefins consisting of isobutylene and diisobutylene, and the other olefin being selected from the class of aralkenyl olefins consisting of styrene, alpha-methyl styrene, para-methyl styrene, para-methyl alpha-methyl styrene and ethyl styrene, the reaction being carried out in an organic solvent -inert to the reactants in the presence of an acidic condensation agent and at a temperature ranging from about -,-:Airnbbeovwmpa ifisn; wma r s ne-an l y i i fini peiym ,j eted fr m th les o e sisting of: a polymer of a conjugated diolefin and a co polymer of? a1 conjuga ed dic fiw wi h: a

th o gh wh 'vnset ir te re b ry 1 uctof ilgabr y y henyl ,IfQPaHB QQ-TIGEEWD; olefins ne o e n b m s e t dzi ema: ama s f 1 3311 lefin m t n s i oba yli e anddi s hutr m and? t boiling point of solvent, and in which about 1 mol of the 2,2-bis(4-hydroxyphenyl)propane and about 4 mols of the two olefins taken as a whole are brought into reactive contact and in which the two olefins are present in about 5 to 25 parts by weight of styrene to parts by weight of isobutylene.

8. A rubbery composition comprising an unsaturated rubbery diolefinic polymer selected from the class consisting of a polymer of a conjugated diolefinand a copolymer of a conjugated diolefin with a monoolefin through which unsaturated rubbery diolefinic polymer is dispersed from about 0.1 to 10 weight percent based on the weight of the unsaturated rubbery diolefinic polymer of a deterioration retarder comprising the reaction product of 2,2-bis(4-hydroxyphenyl)propane and two olefins, one of the olefins being diisobutylene and the other olefin being styrene, the reaction being carried out in an organic solvent inert to thetreactants in the presence of an acidic condensation agent and at a temperature ranging from about 50-" C. up to the boiling point of the inert organic solvent, and in which about 1 mol of the 2,2-bis(4-hydroxyphenyl)propane and about 4 mols of the two olefins taken as a whole are brought into reactive contact and in which the two olefins are present in about 8 to 40 mols of the diisobutylene to about 1 mol of the styrene.

9. A sulfur-vulcanized composition comprising an unsaturated rubbery diolefinic polymer selected from the class consisting of a polymer of a conjugated diolefin and a copolymer of a conjugated diolefin with a monoolefin through which said sulfur-vulcanized composition is dispersed from about 0.1 to about 10 weight percent based on the weight of said unsaturated rubbery diolefinic polymer of a deterioration retarder comprising the reaction the; iineaxta rganic=selveat,='

product of 2,2-bis(4-hydroxyphenyl)propane and two olefins, one olefin being selected from the class of alkenyl olefins consisting of isobutylene and diisobutylene and the in which the two olefins are made up of about 8 to 40 mols of the alkenyl olefin to 1 mol of the aralkenyl olefin.

10. A sulfur-vulcanized composition comprising an unsaturated rubbery diolefinic polymer selected from the class consisting of a polymer of a conjugated diolefin and a copolymer of a conjugated diolefin with a monoolefin through which said sulfur-vulcanized composition is dispersed from about 0.1 to about 10 weight percent based on the weight of said unsaturated rubbery diolefinic polymer of a deterioration retarder comprising the reaction product of 2,2-bis(4-hydroxyphenyl) propane and twoolefins, one olefin being selected from the class of alkenyl olefins consisting of isobutylene and diisobutylene and the other olefin being styrene, the reaction being ing point of the inert organic solvent and in which about 1 mol of the 2,2-bis(4-hydroxyphenyl)propane and about 4 mols of the two olefins taken as a whole are brought into reactive contact and in which the two olefins are present in about 8 to 40 mols of the alkenyl olefin to 1 mol of styrene.

11. A sulfur-vulcanized composition comprising an unsaturated rubbery diolefinic polymer selected from the class consisting of a polymer of a conjugated diolefin and a copolymer of a conjugated diolefin with a monoolefin through which said sulfur-vulcanized composition is dis per-sed from about 0.1 to about 10 weight percent based carried out in an organic solvent inert to the reactants .in the presence of an acidic condensation agent and'at 'a temperature ranging from about 50 C. up to the boilon the weight of said unsaturated rubbery diolefinic polymer of a deterioration retarder comprising the reaction product of 2,2-bis (4-hydroxyphenyl)propane and two olefins, one olefin being isobutylene and the other olefin being styrene, the reaction being carried out in an organic solvent inert to the reactants in the presence of an acidic condensation agent and at a temperature ranging from about C. up to the boiling point of the inert organic solvent, and in which about 1 mol of the 2,2-bis(4- hydroxyphenyl) propane and about 4 mols of the two olefinstaken as a whole are brought into reactive contact and in which the two olefins are present in about 5 to 25 parts by weight of styrene to parts by weight of isobutylene.

12.. A sulfur-vulcanized composition comprising an unsaturated rubbery diolefinic polymer selected from the class consisting of a polymer of a conjugated diolefin and a copolymer of a conjugated diolefin with a monoolefin through which said sulfur-vulcanized composition is dispersed from about 0.1 to about 10 weight percent based on the weight of said unsaturated rubbery dio-lefinic poly.-

mer of a deterioration retarder comprising the reaction product of 2,2-bis(4-hydroxyphenyl)propane and two olefins, one of the olefins being diisobutylene and the other olefin being styrene, the reaction being carried out in an organic solvent inert to the reactants in the presence of an acidic condensation agent and at a temperature ranging from about 50 C. up to the boiling point of the inert organic solvent, 'andin which about 1 mol of the 2,2- bis(4-hydroxyphenyl)propane and'about 4 moles of the two olefins taken 'as a whole are brought into reactive contact and in which the two olefins are present in about 8 to 40 mols of the diisobutylene to about 1 mol of the styrene.

References Cited in the file of this patent UNITED STATES PATENTS 2,636,905 Kehe et al Apr. 28, 1953 2,734,088 Knowles et a1. Feb. 7, 1956 2,745,726 Young et a1 May 15, 1956 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,022,269 February 20, 1962 Jacob E, Jansen et a1.

It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent. should read as corrected below.

Column 2, line 40, after "sulfuric" insert acid c01umn 5 in the heading to table (111), for "122 F." read 212 F. same column 5, in the footnote of the tables,

after PBNA" insert Signed and sealed this 10th day of July 1962.

(SEAL) Attest:

ERNEST w. SWIDER DAVID LADD Attesting Officer Commissioner of Patents 

5. A RUBBERY COMPOSITION COMPRISING AN UNSATURATED RUBBERY DIOLEFINIC POLYMER SELECTED FROM THE CLASS CONSISTING OF A POLYMER OF A CONJUGATED DIOLEFIN AND A COPOLYMER OF A CONJUGATED DIOLEGIN WIHT A MONOOLEFIN THROUGH WHICH UNSATURATED RUBBERY DIOLEFINIC POLYMER IS DISPERSED FROM ABOUT 0.1 TO 10 WEIGHT PERCENT BASED ON THE WEIGHT OFTHE UNSATURATED RUBBERY DIOLEFINIC POLYMER OF A DETERIORATION RETARDER COMPRISING THE REACTIO PRODUCT OF 2,2-BIS(4-HYDROXYPHENYL) PROPANE AND TWO OLEFINS ONE OLEFIN BEING SELECTED FROM THE CLASS OF ALKENYL OLEFINS CONSISTING OF ISOBUTYLENE AND DIISOBUTYLENE, AND THE OTHER OLEFIN BEING SELECTED FROM THE CLASS OF ARALKENYL OLEFINS CONSISTING OF STYRENE, ALPHA-METHYL STYRENE, PARA-METHYL STYRENE, PARA-METHYL ALPHA-METHYL STYRENE AND ETHYL STYRENE, THE REACTION BEING CARRIER OUT IN AN ORGANIC SOLVENT INERT TO THE RECTANTS IN THE PRESENCE OF AN ACIDIC CONDENSATION AGENT AND AT A TEMPERATURE RANGING FROM ABOUT 50*C. UP TO THE BOILING POINT OF THE INERT ORGANIC SOLVENT, AND IN WHICH ABOUT 1 MOL OF THE 2,2-BIS(4-HYDROXYPHENYL) PROPANE AND ABOUT 4 MOLS OFTHE TWO OLEFINS TAKEN AS A WHOLE ARE BROUGHT INTO REACTIVE CONTACT AND IN WHICH THE TOW OLEFINS ARE MADE UP OF ABOUT 8 TO 40 MOLS OF THE ALKENYL OLEFIN TO 1 MOL OF THE ARALKENYL OLEFIN. 